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Statements of Cash Flows (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flows from Operating Activities:      
Net income $ 2,260,564 $ 4,409,324 $ 6,444,350
Adjustments to reconcile net income to net cash provided by operating activities:      
(Increase) decrease in commodity futures trading account - cash and cash equivalents 1,663,093 3,366,714 (5,131,599)
Unrealized (gain) loss on futures contracts 710,660 (1,655,900) 1,239,230
(Increase) decrease in receivable from General Partner (33,405) 57,183 9,284
(Increase) decrease in dividend receivable 452 (696) (54)
(Increase) decrease in interest receivable 0 11 (11)
Increase in other assets (208) (549) (278)
Increase (decrease) in professional fees payable 15,103 (21,183) 23,618
Increase (decrease) in General Partner management fees payable (10,163) (5,637) 26,107
Increase (decrease) in brokerage commissions payable (400) 305 500
Increase (decrease) in other liabilities (215) (168) 1,076
Net cash provided by operating activities 4,605,481 6,149,404 2,612,223
Cash Flows from Financing Activities:      
Addition of partnership shares 118,483,039 89,087,948 205,178,034
Redemption of partnership shares (137,337,227) (85,693,039) (186,969,027)
Net cash provided by (used in) financing activities (18,854,188) 3,394,909 18,209,007
Net Increase (Decrease) in Cash and Cash Equivalents (14,248,707) 9,544,313 20,821,230
Cash and Cash Equivalents, beginning of year 39,506,019 29,961,706 9,140,476
Cash and Cash Equivalents, end of year $ 25,257,312 $ 39,506,019 $ 29,961,706